@Reece ******
you get 30 days on you visa exempt stamp when you enter Thailand, then you apply for the one 30 day extension you are allowed. After that you are eligible to apply for the covid extension, but it is not guaranteed that you will get it, especially if you travel to another country during your 30 days plus your 30 day extension, as you are showing you can leave the country. The covid extension is actually an unable to travel extension because of covid, so don't prove to them that you can travel.